PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Small-scale anisotropy in the cosmic ray flux observed by GRAPES-3 at TeV energies
M. Chakraborty*, S. Ahmad, A. Chandra, S.R. Dugad, U.D. Goswami, S.K. Gupta, B. Hariharan, Y. Hayashi, P. Jagadeesan, A. Jain, P. Jain, S. Kawakami, H. Kojima, S. Mahapatra, P.K. Mohanty, R. Moharana, Y. Muraki, P.K. Nayak, T. Nonaka, A. Oshima, B.P. Pant, D. Pattanaik, G.S. Pradhan, M. Rameez, K. Ramesh, L.V. Reddy, R. Sahoo, R. Scaria, S. Shibata, J. Soni, K. Tanaka, F. Varsi and M. Zuberiet al. (click to show)
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Pre-published on: August 18, 2023
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Abstract
Cosmic ray (CR) anisotropy of several scales have been observed over the last decade by a number of experiments located in the Northern and Southern hemispheres. The GRAPES-3 experiment, located at $11.4^{\circ}$ N can observe a significant portion of both the hemispheres and covers about 56% of the sky at TeV energies. Several small-scale anisotropic features, with a strength of $\sim10^{-4} - 10^{-3}$, have been observed using four years of GRAPES-3 data collected within a period of 2013-2016, by using the method of time-scrambling. Two striking hot-spot regions have been observed with a significance of more than 4$\sigma$. These structures are consistent with the observations reported by Milagro, ARGO-YBJ and HAWC. These structures, their characteristic features and a comparison of results from other experiments are described in this work.
DOI: https://doi.org/10.22323/1.444.0513
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